rust

As a noun faith

is seer, soothsayer.

As a verb rust is

to grow.

As verbs the difference between rust and flat

is that rust is to grow while flat is (poker slang) to make a flat call; to call without.

As an adjective flat is

having no variations in height.

As an adverb flat is

so as to be flat.

As a noun flat is

an area of level ground or flat can be (archaic|new england|now chiefly british) an apartment.

As verbs the difference between scale and rust

is that scale is to change the size of something whilst maintaining proportion; especially to change a process in order to produce much larger amounts of the final product or scale can be to remove the scales of while rust is to grow.

As a noun scale

is (obsolete) a ladder; a series of steps; a means of ascending or scale can be part of an overlapping arrangement of many small, flat and hard pieces of keratin covering the skin of an animal, particularly a fish or reptile or scale can be a device to measure mass or weight.

As a verb rust

is to grow.

As a noun cover is

cover version, cover song.

As verbs the difference between blister and rust

is that blister is to cause blisters to form while rust is to grow.

As a noun blister

is a small bubble between the layers of the skin that contains watery or bloody fluid and is caused by friction and pressure, burning, freezing, chemical irritation, disease or infection.

As verbs the difference between entrust and rust

is that entrust is to trust to the care of while rust is to grow.

As a verb rust

is to grow.

As an adjective undefined is

lacking a definition or value.

As a verb rust

is to grow.

As a noun dirt is

animal.

As a verb rust

is to grow.

As an adjective crusty is

pertaining to or having a crust, as, for example, in the case of bread.

As a noun crusty is

(chiefly|british) a tramp or homeless young person with poor cleanliness.